// $Id$
//
//  Copyright (C) 2007 Greg Landrum
//
//   @@ All Rights Reserved @@
//  This file is part of the RDKit.
//  The contents are covered by the terms of the BSD license
//  which is included in the file license.txt, found at the root
//  of the RDKit source tree.
//
// there's a compiler bug in some versions of g++ that causes this file to not
// compile unless
// we skip the docstrings:
//#define BOOST_PYTHON_NO_PY_SIGNATURES

#define NO_IMPORT_ARRAY
#include <RDBoost/python.h>
#include <string>

#include "rdchem.h"
// ours
#include <GraphMol/RDKitBase.h>

namespace python = boost::python;

namespace RDKit {

namespace {
class EditableMol : boost::noncopyable {
 public:
  EditableMol(const ROMol &m) { dp_mol = new RWMol(m); };
  ~EditableMol() {
    PRECONDITION(dp_mol, "no molecule");
    delete dp_mol;
  };

  void RemoveAtom(unsigned int idx) {
    PRECONDITION(dp_mol, "no molecule");
    dp_mol->removeAtom(idx);
  };
  void RemoveBond(unsigned int idx1, unsigned int idx2) {
    PRECONDITION(dp_mol, "no molecule");
    dp_mol->removeBond(idx1, idx2);
  };
  int AddBond(unsigned int begAtomIdx, unsigned int endAtomIdx,
              Bond::BondType order = Bond::UNSPECIFIED) {
    PRECONDITION(dp_mol, "no molecule");
    return dp_mol->addBond(begAtomIdx, endAtomIdx, order);
  };
  int AddAtom(Atom *atom) {
    PRECONDITION(dp_mol, "no molecule");
    PRECONDITION(atom, "bad atom");
    return dp_mol->addAtom(atom, true, false);
  };
  void ReplaceAtom(unsigned int idx, Atom *atom) {
    PRECONDITION(dp_mol, "no molecule");
    PRECONDITION(atom, "bad atom");
    dp_mol->replaceAtom(idx, atom);
  };
  ROMol *GetMol() const {
    PRECONDITION(dp_mol, "no molecule");
    ROMol *res = new ROMol(*dp_mol);
    return res;
  };

 private:
  RWMol *dp_mol;
};
}

struct EditableMol_wrapper {
  static void wrap() {
    std::string molClassDoc =
        "The EditableMol class.\n\n\
   This class can be used to add/remove bonds and atoms to\n\
   a molecule.\n\
   In order to use it, you need to first construct an EditableMol\n\
   from a standard Mol:\n\
   >>> m = Chem.MolFromSmiles('CCC')\n\
   >>> em = Chem.EditableMol(m)\n\
   >>> em.AddAtom(Chem.Atom(8))\n\
   >>> em.AddBond(0,3,Chem.BondType.SINGLE)\n\
   >>> m2 = em.GetMol()\n\
   >>> Chem.SanitizeMol(m2)\n\
   >>> Chem.MolToSmiles(m2)\n\
   'CCCO'\n\
\n\
   *Note*: It is very, very easy to shoot yourself in the foot with\n\
           this class by constructing an unreasonable molecule.\n\
";
    python::class_<EditableMol, boost::noncopyable>(
        "EditableMol", "an editable molecule class",
        python::init<const ROMol &>("Construct from a Mol"))
        .def("RemoveAtom", &EditableMol::RemoveAtom,
             "Remove the specified atom from the molecule")
        .def("RemoveBond", &EditableMol::RemoveBond,
             "Remove the specified bond from the molecule")

        .def("AddBond", &EditableMol::AddBond,
             (python::arg("mol"), python::arg("beginAtomIdx"),
              python::arg("endAtomIdx"),
              python::arg("order") = Bond::UNSPECIFIED),
             "add a bond, returns the index of the newly added bond")

        .def("AddAtom", &EditableMol::AddAtom,
             (python::arg("mol"), python::arg("atom")),
             "add an atom, returns the index of the newly added atom")
        .def("ReplaceAtom", &EditableMol::ReplaceAtom,
             (python::arg("mol"), python::arg("index"), python::arg("newAtom")),
             "replaces the specified atom with the provided one")
        .def("GetMol", &EditableMol::GetMol,
             "Returns a Mol (a normal molecule)",
             python::return_value_policy<python::manage_new_object>());
  };
};

}  // end of namespace
void wrap_EditableMol() { RDKit::EditableMol_wrapper::wrap(); }
